ubuntu 20.04 apt install PHP8.0

Dependencies required for installation

First, we first install some dependent packages for later installation processing:

sudo apt install  ca-certificates apt-transport-https software-properties-common

First, we execute the following command to install PPA:

sudo add-apt-repository ppa:ondrej/php

There is a note here, that is, half of the execution, the following text needs a carriage return to continue execution.

Press [ENTER] to continue or Ctrl-c to cancel adding it.

After the execution is complete, let's see how much the current default version of PHP has become

$ sudo apt show php
Package: php
Version: 2:8.0+82+ubuntu20.04.1+deb.sury.org+1
Priority: optional
Section: php
Source: php-defaults (82+ubuntu20.04.1+deb.sury.org+1)
Maintainer: Debian PHP Maintainers <[e-mail]>
Installed-Size: 13.3 kB
Depends: php8.0
Download-Size: 6,960 B
APT-Sources: http://ppa.launchpad.net/ondrej/php/ubuntu focal/main amd64 Packages
Description: server-side, HTML-embedded scripting language (default)
 PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used
 open source general-purpose scripting language that is especially suited
 for web development and can be embedded into HTML.
 .
 This package is a dependency package, which depends on latest stable
 PHP version (currently 8.0).

N: 有 1 条附加记录。请加上 ‘-a’ 参数来查看它们

You can see that the default PHP version has changed from 7.4 that comes with the system to 8.0.

Install PHP

Execute the following command to install PHP 8.0:

sudo apt install php-fpm

Also install other versions of PHP as follows:

sudo apt install php7.4-fpm

5.6.* ~ 8.0.* , the PPA currently supports 0614fdb31d998a series.

After the installation is successful, you can execute the command to view the current version:

$ php -v
PHP 8.0.3 (cli) (built: Mar  5 2021 07:54:13) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.3, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.3, Copyright (c), by Zend Technologies

Executable command

The following commands are commonly used:

• php
• php-fpm
• pecl
• phpize
• php-config
• pear
• and many more

path

Log path:

$ ls /var/log/php*
/var/log/php7.4-fpm.log        /var/log/php8.0-fpm.log

Management commands

start up:

sudo systemctl start php8.0-fpm

stop:

sudo systemctl stop php8.0-fpm

Restart:

sudo systemctl restart php8.0-fpm

Set boot up:

sudo systemctl enable php8.0-fpm

Cancel startup

sudo systemctl disable php8.0-fpm

Check running status

sudo systemctl status php8.0-fpm

apt install extension

To install the extension, you can execute the following command:

sudo apt install php-mbstring php-dom php-mysql

Some extensions can be installed in this way.

We can check which extensions can be installed by executing the following command:

sudo apt search php-*

Manually install the extension

First of all, we first install the compilation dependency package of PHP

sudo apt install php-dev

Here is still a reminder, if you want to install a compilation dependency package that is not the default version, you need to execute the version. For example, php7.4-dev .

For example, to install a package that does not exist in apt, you can execute the following command:

sudo pecl install seaslog

This completes the installation.

Configuration file

Here is an introduction to the installation of extensions. Because PHP has two operating modes, one is FPM and the other is CLI. So it can control the way that an extension is only loaded in FPM and not in CLI.

First look at its catalog

$ ls /etc/php/8.0/
cli  fpm  mods-available

First of all, our extended management is stored in mods-available .

Then if we want to control FPM to load this certain configuration, then we must create a soft link.

We can understand by looking at the following command:

$ ll /etc/php/8.0/fpm/conf.d/20-mbstring.ini 
lrwxrwxrwx 1 root root 40  7月 16 22:34 /etc/php/8.0/fpm/conf.d/20-mbstring.ini -> /etc/php/8.0/mods-available/mbstring.ini

All right. Basically the introduction is like this.